git.gag.com Git - fw/stlink/blob - gdbserver/gdb-server.c

   1 /* -*- tab-width:8 -*- */
   2
   3 /*
   4  Copyright (C)  2011 Peter Zotov <whitequark@whitequark.org>
   5  Use of this source code is governed by a BSD-style
   6  license that can be found in the LICENSE file.
   7 */
   8
   9 #include <stdio.h>
  10 #include <string.h>
  11 #include <stdlib.h>
  12 #include <unistd.h>
  13 #include <sys/types.h>
  14 #include <sys/socket.h>
  15 #include <netinet/in.h>
  16 #include <arpa/inet.h>
  17
  18 #include <stlink-common.h>
  19
  20 #include "gdb-remote.h"
  21
  22 #define FLASH_BASE 0x08000000
  23 #define FLASH_PAGE (sl->flash_pgsz)
  24 #define FLASH_PAGE_MASK (~((1 << 10) - 1))
  25 #define FLASH_SIZE (FLASH_PAGE * 128)
  26
  27 static const char hex[] = "0123456789abcdef";
  28
  29 static const char* current_memory_map = NULL;
  30
  31 /*
  32  * Chip IDs are explained in the appropriate programming manual for the
  33  * DBGMCU_IDCODE register (0xE0042000)
  34  */
  35 struct chip_params {
  36         uint32_t chip_id;
  37         char* description;
  38         uint32_t flash_size_reg;
  39         uint32_t max_flash_size, flash_pagesize;
  40         uint32_t sram_size;
  41         uint32_t bootrom_base, bootrom_size;
  42 } const devices[] = {
  43         { 0x410, "F1 Medium-density device", 0x1ffff7e0,
  44           0x20000,  0x400, 0x5000,  0x1ffff000, 0x800  }, // table 2, pm0063
  45         { 0x411, "F2 device", 0, /* No flash size register found in the docs*/
  46           0x100000,   0x20000, 0x20000, 0x1ff00000, 0x7800  }, // table 1, pm0059
  47         { 0x412, "F1 Low-density device", 0x1ffff7e0,
  48           0x8000,   0x400, 0x2800,  0x1ffff000, 0x800  }, // table 1, pm0063
  49         { 0x413, "F4 device", 0x1FFF7A10,
  50           0x100000,   0x20000, 0x20000,  0x1ff00000, 0x7800  }, // table 1, pm0081
  51         { 0x414, "F1 High-density device", 0x1ffff7e0,
  52           0x80000,  0x800, 0x10000, 0x1ffff000, 0x800  },  // table 3 pm0063
  53           // This ignores the EEPROM! (and uses the page erase size,
  54           // not the sector write protection...)
  55         { 0x416, "L1 Med-density device", 0x1FF8004C, // table 1, pm0062
  56           0x20000, 0x100, 0x4000, 0x1ff00000, 0x1000 },
  57         { 0x418, "F1 Connectivity line device", 0x1ffff7e0,
  58           0x40000,  0x800, 0x10000, 0x1fffb000, 0x4800 },
  59         { 0x420, "F1 Medium-density value line device", 0x1ffff7e0,
  60           0x20000,  0x400, 0x2000,  0x1ffff000, 0x800  },
  61         { 0x428, "F1 High-density value line device", 0x1ffff7e0,
  62           0x80000,  0x800, 0x8000,  0x1ffff000, 0x800  },
  63         { 0x430, "F1 XL-density device", 0x1ffff7e0,  // pm0068
  64           0x100000, 0x800, 0x18000, 0x1fffe000, 0x1800 },
  65         { 0 }
  66 };
  67
  68 int serve(stlink_t *sl, int port);
  69 char* make_memory_map(const struct chip_params *params, uint32_t flash_size);
  70
  71 int main(int argc, char** argv) {
  72         if(argc != 3) {
  73                 fprintf(stderr, "Usage: %s <port> /dev/sgX\n", argv[0]);
  74                 return 1;
  75         }
  76
  77         // FIXME - hardcoded to usb....
  78         stlink_t *sl = stlink_open_usb(argv[2], 10);
  79         if (sl == NULL)
  80                 return 1;
  81
  82         if(stlink_current_mode(sl) != STLINK_DEV_DEBUG_MODE)
  83                 stlink_enter_swd_mode(sl);
  84
  85         uint32_t chip_id = stlink_chip_id(sl);
  86         printf("Chip ID is %08x.\n", chip_id);
  87
  88         const struct chip_params* params = NULL;
  89
  90         for(int i = 0; i < sizeof(devices) / sizeof(devices[0]); i++) {
  91                 if(devices[i].chip_id == (chip_id & 0xFFF)) {
  92                         params = &devices[i];
  93                         break;
  94                 }
  95         }
  96
  97         if(params == NULL) {
  98                 fprintf(stderr, "Cannot recognize the connected device!\n");
  99                 return 0;
 100         }
 101
 102         printf("Device connected: %s\n", params->description);
 103         printf("Device parameters: SRAM: 0x%x bytes, Flash: up to 0x%x bytes in pages of 0x%x bytes\n",
 104                 params->sram_size, params->max_flash_size, params->flash_pagesize);
 105
 106         FLASH_PAGE = params->flash_pagesize;
 107
 108         uint32_t flash_size;
 109
 110         stlink_read_mem32(sl, params->flash_size_reg, 4);
 111         flash_size = sl->q_buf[0] | (sl->q_buf[1] << 8);
 112
 113         printf("Flash size is %d KiB.\n", flash_size);
 114         // memory map is in 1k blocks.
 115         current_memory_map = make_memory_map(params, flash_size * 0x400);
 116
 117         int port = atoi(argv[1]);
 118
 119         while(serve(sl, port) == 0);
 120
 121         stlink_close(sl);
 122
 123         return 0;
 124 }
 125
 126 static const char* const memory_map_template =
 127   "<?xml version=\"1.0\"?>"
 128   "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
 129   "     \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
 130   "<memory-map>"
 131   "  <memory type=\"rom\" start=\"0x00000000\" length=\"0x%x\"/>"       // code = sram, bootrom or flash; flash is bigger
 132   "  <memory type=\"ram\" start=\"0x20000000\" length=\"0x%x\"/>"       // sram 8k
 133   "  <memory type=\"flash\" start=\"0x08000000\" length=\"0x%x\">"
 134   "    <property name=\"blocksize\">0x%x</property>"
 135   "  </memory>"
 136   "  <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>" // peripheral regs
 137   "  <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>" // cortex regs
 138   "  <memory type=\"rom\" start=\"0x%08x\" length=\"0x%x\"/>"           // bootrom
 139   "  <memory type=\"rom\" start=\"0x1ffff800\" length=\"0x8\"/>"        // option byte area
 140   "</memory-map>";
 141
 142 char* make_memory_map(const struct chip_params *params, uint32_t flash_size) {
 143         /* This will be freed in serve() */
 144         char* map = malloc(4096);
 145         map[0] = '\0';
 146
 147         snprintf(map, 4096, memory_map_template,
 148                         flash_size,
 149                         params->sram_size,
 150                         flash_size, params->flash_pagesize,
 151                         params->bootrom_base, params->bootrom_size);
 152
 153         return map;
 154 }
 155
 156
 157 /*
 158  * DWT_COMP0     0xE0001020
 159  * DWT_MASK0     0xE0001024
 160  * DWT_FUNCTION0 0xE0001028
 161  * DWT_COMP1     0xE0001030
 162  * DWT_MASK1     0xE0001034
 163  * DWT_FUNCTION1 0xE0001038
 164  * DWT_COMP2     0xE0001040
 165  * DWT_MASK2     0xE0001044
 166  * DWT_FUNCTION2 0xE0001048
 167  * DWT_COMP3     0xE0001050
 168  * DWT_MASK3     0xE0001054
 169  * DWT_FUNCTION3 0xE0001058
 170  */
 171
 172 #define DATA_WATCH_NUM 4
 173
 174 enum watchfun { WATCHDISABLED = 0, WATCHREAD = 5, WATCHWRITE = 6, WATCHACCESS = 7 };
 175
 176 struct code_hw_watchpoint {
 177         stm32_addr_t addr;
 178         uint8_t mask;
 179         enum watchfun fun;
 180 };
 181
 182 struct code_hw_watchpoint data_watches[DATA_WATCH_NUM];
 183
 184 static void init_data_watchpoints(stlink_t *sl) {
 185         #ifdef DEBUG
 186         printf("init watchpoints\n");
 187         #endif
 188
 189         // set trcena in debug command to turn on dwt unit
 190         stlink_read_mem32(sl, 0xE000EDFC, 4);
 191         sl->q_buf[3] |= 1;
 192         stlink_write_mem32(sl, 0xE000EDFC, 4);
 193
 194         // make sure all watchpoints are cleared
 195         memset(sl->q_buf, 0, 4);
 196         for(int i = 0; i < DATA_WATCH_NUM; i++) {
 197                 data_watches[i].fun = WATCHDISABLED;
 198                 stlink_write_mem32(sl, 0xe0001028 + i * 16, 4);
 199         }
 200 }
 201
 202 static int add_data_watchpoint(stlink_t *sl, enum watchfun wf, stm32_addr_t addr, unsigned int len)
 203 {
 204         int i = 0;
 205         uint32_t mask;
 206
 207         // computer mask
 208         // find a free watchpoint
 209         // configure
 210
 211         mask = -1;
 212         i = len;
 213         while(i) {
 214                 i >>= 1;
 215                 mask++;
 216         }
 217
 218         if((mask != -1) && (mask < 16)) {
 219                 for(i = 0; i < DATA_WATCH_NUM; i++) {
 220                         // is this an empty slot ?
 221                         if(data_watches[i].fun == WATCHDISABLED) {
 222                                 #ifdef DEBUG
 223                                 printf("insert watchpoint %d addr %x wf %u mask %u len %d\n", i, addr, wf, mask, len);
 224                                 #endif
 225
 226                                 data_watches[i].fun = wf;
 227                                 data_watches[i].addr = addr;
 228                                 data_watches[i].mask = mask;
 229
 230                                 // insert comparator address
 231                                 sl->q_buf[0] = (addr & 0xff);
 232                                 sl->q_buf[1] = ((addr >> 8) & 0xff);
 233                                 sl->q_buf[2] = ((addr >> 16) & 0xff);
 234                                 sl->q_buf[3] = ((addr >> 24)  & 0xff);
 235
 236                                 stlink_write_mem32(sl, 0xE0001020 + i * 16, 4);
 237
 238                                 // insert mask
 239                                 memset(sl->q_buf, 0, 4);
 240                                 sl->q_buf[0] = mask;
 241                                 stlink_write_mem32(sl, 0xE0001024 + i * 16, 4);
 242
 243                                 // insert function
 244                                 memset(sl->q_buf, 0, 4);
 245                                 sl->q_buf[0] = wf;
 246                                 stlink_write_mem32(sl, 0xE0001028 + i * 16, 4);
 247
 248                                 // just to make sure the matched bit is clear !
 249                                 stlink_read_mem32(sl,  0xE0001028 + i * 16, 4);
 250                                 return 0;
 251                         }
 252                 }
 253         }
 254
 255         #ifdef DEBUG
 256         printf("failure: add watchpoints addr %x wf %u len %u\n", addr, wf, len);
 257         #endif
 258         return -1;
 259 }
 260
 261 static int delete_data_watchpoint(stlink_t *sl, stm32_addr_t addr)
 262 {
 263         int i;
 264
 265         for(i = 0 ; i < DATA_WATCH_NUM; i++) {
 266                 if((data_watches[i].addr == addr) && (data_watches[i].fun != WATCHDISABLED)) {
 267                         #ifdef DEBUG
 268                         printf("delete watchpoint %d addr %x\n", i, addr);
 269                         #endif
 270
 271                         memset(sl->q_buf, 0, 4);
 272                         data_watches[i].fun = WATCHDISABLED;
 273                         stlink_write_mem32(sl, 0xe0001028 + i * 16, 4);
 274
 275                         return 0;
 276                 }
 277         }
 278
 279         #ifdef DEBUG
 280         printf("failure: delete watchpoint addr %x\n", addr);
 281         #endif
 282
 283         return -1;
 284 }
 285
 286 #define CODE_BREAK_NUM  6
 287 #define CODE_BREAK_LOW  0x01
 288 #define CODE_BREAK_HIGH 0x02
 289
 290 struct code_hw_breakpoint {
 291         stm32_addr_t addr;
 292         int          type;
 293 };
 294
 295 struct code_hw_breakpoint code_breaks[CODE_BREAK_NUM];
 296
 297 static void init_code_breakpoints(stlink_t *sl) {
 298         memset(sl->q_buf, 0, 4);
 299         sl->q_buf[0] = 0x03; // KEY | ENABLE
 300         stlink_write_mem32(sl, CM3_REG_FP_CTRL, 4);
 301         printf("KARL - should read back as 0x03, not 60 02 00 00\n");
 302         stlink_read_mem32(sl, CM3_REG_FP_CTRL, 4);
 303
 304         memset(sl->q_buf, 0, 4);
 305         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 306                 code_breaks[i].type = 0;
 307                 stlink_write_mem32(sl, CM3_REG_FP_COMP0 + i * 4, 4);
 308         }
 309 }
 310
 311 static int update_code_breakpoint(stlink_t *sl, stm32_addr_t addr, int set) {
 312         stm32_addr_t fpb_addr = addr & ~0x3;
 313         int type = addr & 0x2 ? CODE_BREAK_HIGH : CODE_BREAK_LOW;
 314
 315         if(addr & 1) {
 316                 fprintf(stderr, "update_code_breakpoint: unaligned address %08x\n", addr);
 317                 return -1;
 318         }
 319
 320         int id = -1;
 321         for(int i = 0; i < CODE_BREAK_NUM; i++) {
 322                 if(fpb_addr == code_breaks[i].addr ||
 323                         (set && code_breaks[i].type == 0)) {
 324                         id = i;
 325                         break;
 326                 }
 327         }
 328
 329         if(id == -1) {
 330                 if(set) return -1; // Free slot not found
 331                 else    return 0;  // Breakpoint is already removed
 332         }
 333
 334         struct code_hw_breakpoint* brk = &code_breaks[id];
 335
 336         brk->addr = fpb_addr;
 337
 338         if(set) brk->type |= type;
 339         else    brk->type &= ~type;
 340
 341         memset(sl->q_buf, 0, 4);
 342
 343         if(brk->type == 0) {
 344                 #ifdef DEBUG
 345                 printf("clearing hw break %d\n", id);
 346                 #endif
 347
 348                 stlink_write_mem32(sl, 0xe0002008 + id * 4, 4);
 349         } else {
 350                 sl->q_buf[0] = ( brk->addr        & 0xff) | 1;
 351                 sl->q_buf[1] = ((brk->addr >> 8)  & 0xff);
 352                 sl->q_buf[2] = ((brk->addr >> 16) & 0xff);
 353                 sl->q_buf[3] = ((brk->addr >> 24) & 0xff) | (brk->type << 6);
 354
 355                 #ifdef DEBUG
 356                 printf("setting hw break %d at %08x (%d)\n",
 357                         id, brk->addr, brk->type);
 358                 printf("reg %02x %02x %02x %02x\n",
 359                         sl->q_buf[3], sl->q_buf[2], sl->q_buf[1], sl->q_buf[0]);
 360                 #endif
 361
 362                 stlink_write_mem32(sl, 0xe0002008 + id * 4, 4);
 363         }
 364
 365         return 0;
 366 }
 367
 368
 369 struct flash_block {
 370         stm32_addr_t addr;
 371         unsigned     length;
 372         uint8_t*     data;
 373
 374         struct flash_block* next;
 375 };
 376
 377 static struct flash_block* flash_root;
 378
 379 static int flash_add_block(stm32_addr_t addr, unsigned length,
 380                            stlink_t *sl) {
 381         if(addr < FLASH_BASE || addr + length > FLASH_BASE + FLASH_SIZE) {
 382                 fprintf(stderr, "flash_add_block: incorrect bounds\n");
 383                 return -1;
 384         }
 385
 386         if(addr % FLASH_PAGE != 0 || length % FLASH_PAGE != 0) {
 387                 fprintf(stderr, "flash_add_block: unaligned block\n");
 388                 return -1;
 389         }
 390
 391         struct flash_block* new = malloc(sizeof(struct flash_block));
 392         new->next = flash_root;
 393
 394         new->addr   = addr;
 395         new->length = length;
 396         new->data   = calloc(length, 1);
 397
 398         flash_root = new;
 399
 400         return 0;
 401 }
 402
 403 static int flash_populate(stm32_addr_t addr, uint8_t* data, unsigned length) {
 404         int fit_blocks = 0, fit_length = 0;
 405
 406         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 407                 /* Block: ------X------Y--------
 408                  * Data:            a-----b
 409                  *                a--b
 410                  *            a-----------b
 411                  * Block intersects with data, if:
 412                  *  a < Y && b > x
 413                  */
 414
 415                 unsigned X = fb->addr, Y = fb->addr + fb->length;
 416                 unsigned a = addr, b = addr + length;
 417                 if(a < Y && b > X) {
 418                         // from start of the block
 419                         unsigned start = (a > X ? a : X) - X;
 420                         unsigned end   = (b > Y ? Y : b) - X;
 421
 422                         memcpy(fb->data + start, data, end - start);
 423
 424                         fit_blocks++;
 425                         fit_length += end - start;
 426                 }
 427         }
 428
 429         if(fit_blocks == 0) {
 430                 fprintf(stderr, "Unfit data block %08x -> %04x\n", addr, length);
 431                 return -1;
 432         }
 433
 434         if(fit_length != length) {
 435                 fprintf(stderr, "warning: data block %08x -> %04x truncated to %04x\n",
 436                         addr, length, fit_length);
 437                 fprintf(stderr, "(this is not an error, just a GDB glitch)\n");
 438         }
 439
 440         return 0;
 441 }
 442
 443 static int flash_go(stlink_t *sl) {
 444         int error = -1;
 445
 446         // Some kinds of clock settings do not allow writing to flash.
 447         stlink_reset(sl);
 448
 449         for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
 450                 #ifdef DEBUG
 451                 printf("flash_do: block %08x -> %04x\n", fb->addr, fb->length);
 452                 #endif
 453
 454                 unsigned length = fb->length;
 455                 for(stm32_addr_t page = fb->addr; page < fb->addr + fb->length; page += FLASH_PAGE) {
 456                         #ifdef DEBUG
 457                         printf("flash_do: page %08x\n", page);
 458                         #endif
 459
 460                         stlink_erase_flash_page(sl, page);
 461
 462                         if(stlink_write_flash(sl, page, fb->data + (page - fb->addr),
 463                                         length > FLASH_PAGE ? FLASH_PAGE : length) < 0)
 464                                 goto error;
 465                 }
 466
 467         }
 468
 469         stlink_reset(sl);
 470
 471         error = 0;
 472
 473 error:
 474         for(struct flash_block* fb = flash_root, *next; fb; fb = next) {
 475                 next = fb->next;
 476                 free(fb->data);
 477                 free(fb);
 478         }
 479
 480         flash_root = NULL;
 481
 482         return error;
 483 }
 484
 485 int serve(stlink_t *sl, int port) {
 486         int sock = socket(AF_INET, SOCK_STREAM, 0);
 487         if(sock < 0) {
 488                 perror("socket");
 489                 return 1;
 490         }
 491
 492         unsigned int val = 1;
 493         setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
 494
 495         struct sockaddr_in serv_addr = {0};
 496         serv_addr.sin_family = AF_INET;
 497         serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
 498         serv_addr.sin_port = htons(port);
 499
 500         if(bind(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
 501                 perror("bind");
 502                 return 1;
 503         }
 504
 505         if(listen(sock, 5) < 0) {
 506                 perror("listen");
 507                 return 1;
 508         }
 509
 510         stlink_force_debug(sl);
 511         stlink_reset(sl);
 512         init_code_breakpoints(sl);
 513         init_data_watchpoints(sl);
 514
 515         printf("Listening at *:%d...\n", port);
 516
 517         int client = accept(sock, NULL, NULL);
 518         if(client < 0) {
 519                 perror("accept");
 520                 return 1;
 521         }
 522
 523         close(sock);
 524
 525         printf("GDB connected.\n");
 526
 527         /*
 528          * To allow resetting the chip from GDB it is required to
 529          * emulate attaching and detaching to target.
 530          */
 531         unsigned int attached = 1;
 532
 533         while(1) {
 534                 char* packet;
 535
 536                 int status = gdb_recv_packet(client, &packet);
 537                 if(status < 0) {
 538                         fprintf(stderr, "cannot recv: %d\n", status);
 539                         return 1;
 540                 }
 541
 542                 #ifdef DEBUG
 543                 printf("recv: %s\n", packet);
 544                 #endif
 545
 546                 char* reply = NULL;
 547                 reg regp;
 548
 549                 switch(packet[0]) {
 550                 case 'q': {
 551                         if(packet[1] == 'P' || packet[1] == 'C' || packet[1] == 'L') {
 552                                 reply = strdup("");
 553                                 break;
 554                         }
 555
 556                         char *separator = strstr(packet, ":"), *params = "";
 557                         if(separator == NULL) {
 558                                 separator = packet + strlen(packet);
 559                         } else {
 560                                 params = separator + 1;
 561                         }
 562
 563                         unsigned queryNameLength = (separator - &packet[1]);
 564                         char* queryName = calloc(queryNameLength + 1, 1);
 565                         strncpy(queryName, &packet[1], queryNameLength);
 566
 567                         #ifdef DEBUG
 568                         printf("query: %s;%s\n", queryName, params);
 569                         #endif
 570
 571                         if(!strcmp(queryName, "Supported")) {
 572                                 reply = strdup("PacketSize=3fff;qXfer:memory-map:read+");
 573                         } else if(!strcmp(queryName, "Xfer")) {
 574                                 char *type, *op, *annex, *s_addr, *s_length;
 575                                 char *tok = params;
 576
 577                                 type     = strsep(&tok, ":");
 578                                 op       = strsep(&tok, ":");
 579                                 annex    = strsep(&tok, ":");
 580                                 s_addr   = strsep(&tok, ",");
 581                                 s_length = tok;
 582
 583                                 unsigned addr = strtoul(s_addr, NULL, 16),
 584                                        length = strtoul(s_length, NULL, 16);
 585
 586                                 #ifdef DEBUG
 587                                 printf("Xfer: type:%s;op:%s;annex:%s;addr:%d;length:%d\n",
 588                                         type, op, annex, addr, length);
 589                                 #endif
 590
 591                                 const char* data = NULL;
 592
 593                                 if(!strcmp(type, "memory-map") && !strcmp(op, "read"))
 594                                         data = current_memory_map;
 595
 596                                 if(data) {
 597                                         unsigned data_length = strlen(data);
 598                                         if(addr + length > data_length)
 599                                                 length = data_length - addr;
 600
 601                                         if(length == 0) {
 602                                                 reply = strdup("l");
 603                                         } else {
 604                                                 reply = calloc(length + 2, 1);
 605                                                 reply[0] = 'm';
 606                                                 strncpy(&reply[1], data, length);
 607                                         }
 608                                 }
 609                         }
 610
 611                         if(reply == NULL)
 612                                 reply = strdup("");
 613
 614                         free(queryName);
 615
 616                         break;
 617                 }
 618
 619                 case 'v': {
 620                         char *params = NULL;
 621                         char *cmdName = strtok_r(packet, ":;", &params);
 622
 623                         cmdName++; // vCommand -> Command
 624
 625                         if(!strcmp(cmdName, "FlashErase")) {
 626                                 char *s_addr, *s_length;
 627                                 char *tok = params;
 628
 629                                 s_addr   = strsep(&tok, ",");
 630                                 s_length = tok;
 631
 632                                 unsigned addr = strtoul(s_addr, NULL, 16),
 633                                        length = strtoul(s_length, NULL, 16);
 634
 635                                 #ifdef DEBUG
 636                                 printf("FlashErase: addr:%08x,len:%04x\n",
 637                                         addr, length);
 638                                 #endif
 639
 640                                 if(flash_add_block(addr, length, sl) < 0) {
 641                                         reply = strdup("E00");
 642                                 } else {
 643                                         reply = strdup("OK");
 644                                 }
 645                         } else if(!strcmp(cmdName, "FlashWrite")) {
 646                                 char *s_addr, *data;
 647                                 char *tok = params;
 648
 649                                 s_addr = strsep(&tok, ":");
 650                                 data   = tok;
 651
 652                                 unsigned addr = strtoul(s_addr, NULL, 16);
 653                                 unsigned data_length = status - (data - packet);
 654
 655                                 // Length of decoded data cannot be more than
 656                                 // encoded, as escapes are removed.
 657                                 // Additional byte is reserved for alignment fix.
 658                                 uint8_t *decoded = calloc(data_length + 1, 1);
 659                                 unsigned dec_index = 0;
 660                                 for(int i = 0; i < data_length; i++) {
 661                                         if(data[i] == 0x7d) {
 662                                                 i++;
 663                                                 decoded[dec_index++] = data[i] ^ 0x20;
 664                                         } else {
 665                                                 decoded[dec_index++] = data[i];
 666                                         }
 667                                 }
 668
 669                                 // Fix alignment
 670                                 if(dec_index % 2 != 0)
 671                                         dec_index++;
 672
 673                                 #ifdef DEBUG
 674                                 printf("binary packet %d -> %d\n", data_length, dec_index);
 675                                 #endif
 676
 677                                 if(flash_populate(addr, decoded, dec_index) < 0) {
 678                                         reply = strdup("E00");
 679                                 } else {
 680                                         reply = strdup("OK");
 681                                 }
 682                         } else if(!strcmp(cmdName, "FlashDone")) {
 683                                 if(flash_go(sl) < 0) {
 684                                         reply = strdup("E00");
 685                                 } else {
 686                                         reply = strdup("OK");
 687                                 }
 688                         } else if(!strcmp(cmdName, "Kill")) {
 689                                 attached = 0;
 690
 691                                 reply = strdup("OK");
 692                         }
 693
 694                         if(reply == NULL)
 695                                 reply = strdup("");
 696
 697                         break;
 698                 }
 699
 700                 case 'c':
 701                         stlink_run(sl);
 702
 703                         while(1) {
 704                                 int status = gdb_check_for_interrupt(client);
 705                                 if(status < 0) {
 706                                         fprintf(stderr, "cannot check for int: %d\n", status);
 707                                         return 1;
 708                                 }
 709
 710                                 if(status == 1) {
 711                                         stlink_force_debug(sl);
 712                                         break;
 713                                 }
 714
 715                                 stlink_status(sl);
 716                                 if(sl->core_stat == STLINK_CORE_HALTED) {
 717                                         break;
 718                                 }
 719
 720                                 usleep(100000);
 721                         }
 722
 723                         reply = strdup("S05"); // TRAP
 724                         break;
 725
 726                 case 's':
 727                         stlink_step(sl);
 728
 729                         reply = strdup("S05"); // TRAP
 730                         break;
 731
 732                 case '?':
 733                         if(attached) {
 734                                 reply = strdup("S05"); // TRAP
 735                         } else {
 736                                 /* Stub shall reply OK if not attached. */
 737                                 reply = strdup("OK");
 738                         }
 739                         break;
 740
 741                 case 'g':
 742                         stlink_read_all_regs(sl, &regp);
 743
 744                         reply = calloc(8 * 16 + 1, 1);
 745                         for(int i = 0; i < 16; i++)
 746                                 sprintf(&reply[i * 8], "%08x", htonl(regp.r[i]));
 747
 748                         break;
 749
 750                 case 'p': {
 751                         unsigned id = strtoul(&packet[1], NULL, 16);
 752                         unsigned myreg = 0xDEADDEAD;
 753
 754                         if(id < 16) {
 755                                 stlink_read_reg(sl, id, &regp);
 756                                 myreg = htonl(regp.r[id]);
 757                         } else if(id == 0x19) {
 758                                 stlink_read_reg(sl, 16, &regp);
 759                                 myreg = htonl(regp.xpsr);
 760                         } else {
 761                                 reply = strdup("E00");
 762                         }
 763
 764                         reply = calloc(8 + 1, 1);
 765                         sprintf(reply, "%08x", myreg);
 766
 767                         break;
 768                 }
 769
 770                 case 'P': {
 771                         char* s_reg = &packet[1];
 772                         char* s_value = strstr(&packet[1], "=") + 1;
 773
 774                         unsigned reg   = strtoul(s_reg,   NULL, 16);
 775                         unsigned value = strtoul(s_value, NULL, 16);
 776
 777                         if(reg < 16) {
 778                                 stlink_write_reg(sl, ntohl(value), reg);
 779                         } else if(reg == 0x19) {
 780                                 stlink_write_reg(sl, ntohl(value), 16);
 781                         } else {
 782                                 reply = strdup("E00");
 783                         }
 784
 785                         if(!reply) {
 786                                 reply = strdup("OK");
 787                         }
 788
 789                         break;
 790                 }
 791
 792                 case 'G':
 793                         for(int i = 0; i < 16; i++) {
 794                                 char str[9] = {0};
 795                                 strncpy(str, &packet[1 + i * 8], 8);
 796                                 uint32_t reg = strtoul(str, NULL, 16);
 797                                 stlink_write_reg(sl, ntohl(reg), i);
 798                         }
 799
 800                         reply = strdup("OK");
 801                         break;
 802
 803                 case 'm': {
 804                         char* s_start = &packet[1];
 805                         char* s_count = strstr(&packet[1], ",") + 1;
 806
 807                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 808                         unsigned     count = strtoul(s_count, NULL, 16);
 809
 810                         unsigned adj_start = start % 4;
 811
 812                         stlink_read_mem32(sl, start - adj_start, (count % 4 == 0) ?
 813                                                 count : count + 4 - (count % 4));
 814
 815                         reply = calloc(count * 2 + 1, 1);
 816                         for(int i = 0; i < count; i++) {
 817                                 reply[i * 2 + 0] = hex[sl->q_buf[i + adj_start] >> 4];
 818                                 reply[i * 2 + 1] = hex[sl->q_buf[i + adj_start] & 0xf];
 819                         }
 820
 821                         break;
 822                 }
 823
 824                 case 'M': {
 825                         char* s_start = &packet[1];
 826                         char* s_count = strstr(&packet[1], ",") + 1;
 827                         char* hexdata = strstr(packet, ":") + 1;
 828
 829                         stm32_addr_t start = strtoul(s_start, NULL, 16);
 830                         unsigned     count = strtoul(s_count, NULL, 16);
 831
 832                         for(int i = 0; i < count; i ++) {
 833                                 char hex[3] = { hexdata[i*2], hexdata[i*2+1], 0 };
 834                                 uint8_t byte = strtoul(hex, NULL, 16);
 835                                 sl->q_buf[i] = byte;
 836                         }
 837
 838                         if((count % 4) == 0 && (start % 4) == 0) {
 839                                 stlink_write_mem32(sl, start, count);
 840                         } else {
 841                                 stlink_write_mem8(sl, start, count);
 842                         }
 843
 844                         reply = strdup("OK");
 845
 846                         break;
 847                 }
 848
 849                 case 'Z': {
 850                         char *endptr;
 851                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
 852                         stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
 853
 854                         switch (packet[1]) {
 855                                 case '1':
 856                                 if(update_code_breakpoint(sl, addr, 1) < 0) {
 857                                         reply = strdup("E00");
 858                                 } else {
 859                                         reply = strdup("OK");
 860                                 }
 861                                 break;
 862
 863                                 case '2':   // insert write watchpoint
 864                                 case '3':   // insert read  watchpoint
 865                                 case '4':   // insert access watchpoint
 866                                 {
 867                                         enum watchfun wf;
 868                                         if(packet[1] == '2') {
 869                                                 wf = WATCHWRITE;
 870                                         } else if(packet[1] == '3') {
 871                                                 wf = WATCHREAD;
 872                                         } else {
 873                                                 wf = WATCHACCESS;
 874                                                 if(add_data_watchpoint(sl, wf, addr, len) < 0) {
 875                                                         reply = strdup("E00");
 876                                                 } else {
 877                                                         reply = strdup("OK");
 878                                                         break;
 879                                                 }
 880                                         }
 881                                 }
 882
 883                                 default:
 884                                 reply = strdup("");
 885                         }
 886                         break;
 887                 }
 888                 case 'z': {
 889                         char *endptr;
 890                         stm32_addr_t addr = strtoul(&packet[3], &endptr, 16);
 891                         //stm32_addr_t len  = strtoul(&endptr[1], NULL, 16);
 892
 893                         switch (packet[1]) {
 894                                 case '1': // remove breakpoint
 895                                 update_code_breakpoint(sl, addr, 0);
 896                                 reply = strdup("OK");
 897                                 break;
 898
 899                                 case '2' : // remove write watchpoint
 900                                 case '3' : // remove read watchpoint
 901                                 case '4' : // remove access watchpoint
 902                                 if(delete_data_watchpoint(sl, addr) < 0) {
 903                                         reply = strdup("E00");
 904                                 } else {
 905                                         reply = strdup("OK");
 906                                         break;
 907                                 }
 908
 909                                 default:
 910                                 reply = strdup("");
 911                         }
 912                         break;
 913                 }
 914
 915                 case '!': {
 916                         /*
 917                          * Enter extended mode which allows restarting.
 918                          * We do support that always.
 919                          */
 920
 921                         reply = strdup("OK");
 922
 923                         break;
 924                 }
 925
 926                 case 'R': {
 927                         /* Reset the core. */
 928
 929                         stlink_reset(sl);
 930                         init_code_breakpoints(sl);
 931                         init_data_watchpoints(sl);
 932
 933                         attached = 1;
 934
 935                         reply = strdup("OK");
 936
 937                         break;
 938                 }
 939
 940                 default:
 941                         reply = strdup("");
 942                 }
 943
 944                 if(reply) {
 945                         #ifdef DEBUG
 946                         printf("send: %s\n", reply);
 947                         #endif
 948
 949                         int result = gdb_send_packet(client, reply);
 950                         if(result != 0) {
 951                                 fprintf(stderr, "cannot send: %d\n", result);
 952                                 return 1;
 953                         }
 954
 955                         free(reply);
 956                 }
 957
 958                 free(packet);
 959         }
 960
 961         return 0;
 962 }